[docs] [issue34768] Add documentation explaining __init__.py in packages

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I think the expectation is that people will know about modules and packages long before they upload things to PyPI.  The import system and the packaging tools are two independent domains.

For example the official tutorial has an intro: https://docs.python.org/3/tutorial/modules.html#packages

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nosy: +eric.araujo

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